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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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2008 D5 Oil Filler Popping - Even When Vacuum Line ClampedViews : 770 Replies : 10Users Viewing This Thread : |
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Feb 12th, 2024, 14:24 | #1 |
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2008 D5 Oil Filler Popping - Even When Vacuum Line Clamped
As per title, When I'm getting the usual popping noise, and some smoke from the oil filler, but the sound doesnt change at all when I clamp any of the vacuum lines from the vacuum pump.
Could this be the PCV? there is a fair bit of oily residue around the pipes for this. It is also chuffing out of the swirl flap lever area under load. No sound round the intake of air box, so hoping its not the dodgy valve lifter issue. Thoughts and first hand experiences of what it could be? Thanks |
Feb 12th, 2024, 15:06 | #2 | |
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Quote:
I learned to live with it.
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Feb 12th, 2024, 21:10 | #3 |
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But would the smoke coming from the swirl flap lever area indicate too much pressure?
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Feb 13th, 2024, 11:20 | #4 |
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Popping goes away if you repair leaks in the vacuum tract (engine mounts /egr bypassvalve with manual transmissions)
The popping noise is discharged air which is sucked in trough leaks , with perfect vacuum there is no air to pop in the valvecover ;-) https://www.youtube.com/watch?v=GsiMgQuITSI Last edited by 5cilinder; Feb 13th, 2024 at 11:46. |
Feb 13th, 2024, 16:28 | #5 |
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No, there shouldn't be smoke coming from that area. As for the popping noise, I learned to live with it. I can only hear it when I take the oil cap off with the engine running. It doesn't affect the running of the car.
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Feb 13th, 2024, 17:10 | #6 |
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It’s not too clear from that video what he’s doing. Presume removing the pipe from the vacuum pump to initiate the popping?
If I clamp the hose, it makes no difference. If I take the brake booster pipe off, the popping almost disappears. Brakes appear to be fine. |
Feb 14th, 2024, 04:53 | #7 | |
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Quote:
Then you have a tiny leak in the breakbooster,(separate bigger hose)so the vacuum pump can generate enough vacuum to let it function but the amount of removed air causes the popping sound |
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Feb 14th, 2024, 17:18 | #8 |
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Right, thanks.
I’d better check the pipe work between the booster and the vacuum pump. |
Mar 6th, 2024, 16:44 | #9 |
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A little update. I haven't had a chance to investigate the brake booster hose yet, but have noticed that I can hear the popping through the intake area when the engine is hot.
Does this point more towards Lifters? What years are more likely to suffer this? |
Mar 7th, 2024, 13:10 | #10 |
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post a clip
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